Added rect draw api

Added some new maths types
Updated shaders to use new D_Rect structure
Added rect buffers to frames
Misc cleanup

code/core/core.c

@@ -1,2 +1,3 @@
 #include "impl/arena.c"
 #include "impl/string.c"
+#include "impl/math.c"

code/core/core.h

@@ -6,5 +6,6 @@
 #include "macros.h"
 #include "arena.h"
 #include "string.h"
+#include "math.h"
 
 #endif  // LD_CORE_CORE_H_

code/core/impl/math.c

@@ -0,0 +1,163 @@
+V2f V2F(F32 x, F32 y) {
+	V2f result = { x, y };
+	return result;
+}
+
+V3f V3F(F32 x, F32 y, F32 z) {
+	V3f result = { x, y, z };
+	return result;
+}
+
+V4f V4F(F32 x, F32 y, F32 z, F32 w) {
+	V4f result = { x, y, z, w };
+	return result;
+}
+
+R2f R2F(V2f min, V2f max) {
+	R2f result = { min, max };
+	return result;
+}
+
+V3f V3f_Neg(V3f x) {
+	V3f result = { -x.x, -x.y, -x.z };
+	return result;
+}
+
+V3f V3f_Scale(V3f x, F32 s) {
+	V3f result = { s * x.x, s * x.y, s * x.z };
+	return result;
+}
+
+F32 V3f_Dot(V3f a, V3f b) {
+	F32 result = (a.x * b.x) + (a.y * b.y) + (a.z * b.z);
+	return result;
+}
+
+F32 V4f_Dot(V4f a, V4f b) {
+	F32 result = (a.x * b.x) + (a.y * b.y) + (a.z * b.z) + (a.w * b.w);
+	return result;
+}
+
+Mat4x4F M4x4F_Rows(V3f x, V3f y, V3f z) {
+	Mat4x4F result = {
+		x.x, x.y, x.z, 0,
+		y.x, y.y, y.z, 0,
+		z.x, z.y, z.z, 0,
+		0,   0,   0,   1
+	};
+
+	return result;
+}
+
+Mat4x4F M4x4F_Columns(V3f x, V3f y, V3f z) {
+	Mat4x4F result = {
+		x.x, y.x, z.x, 0,
+		x.y, y.y, z.y, 0,
+		x.z, y.z, z.z, 0,
+		0,   0,   0,   1
+	};
+
+	return result;
+}
+
+Mat4x4F M4x4F_Mul(Mat4x4F a, Mat4x4F b) {
+	Mat4x4F result;
+
+	for (U32 r = 0; r < 4; ++r) {
+		for (U32 c = 0; c < 4; ++c) {
+			result.m[r][c] =
+				(a.m[r][0] * b.m[0][c]) + (a.m[r][1] * b.m[1][c]) +
+				(a.m[r][2] * b.m[2][c]) + (a.m[r][3] * b.m[3][c]);
+		}
+	}
+
+	return result;
+}
+
+V4f M4x4F_VMul4(Mat4x4F m, V4f v) {
+	V4f result;
+	result.x = V4f_Dot(m.r[0], v);
+	result.y = V4f_Dot(m.r[1], v);
+	result.z = V4f_Dot(m.r[2], v);
+	result.w = V4f_Dot(m.r[3], v);
+
+	return result;
+}
+
+V3f M4x4F_VMul3(Mat4x4F m, V3f v) {
+	V4f tx;
+	tx.xyz = v;
+	tx.w   = 1.0f;
+
+	V3f result = M4x4F_VMul4(m, tx).xyz;
+	return result;
+}
+
+Mat4x4FInv M4x4F_Perspective(F32 fov, F32 aspect, F32 nearp, F32 farp) {
+	F32 focal_length = 1.0f / tanf(0.5f * (PI_F32 * (fov / 360.0f)));
+
+	F32 a = focal_length;
+	F32 b = focal_length * aspect;
+
+	F32 c = -(nearp + farp) / (farp - nearp);
+	F32 d = -(2.0f * nearp * farp) / (farp - nearp);
+
+	Mat4x4FInv result = {
+		// fwd
+		{
+			a, 0,  0, 0,
+			0, b,  0, 0,
+			0, 0,  c, d,
+			0, 0, -1, 0
+		},
+		// inv
+		{
+			(1 / a),  0,       0,      0,
+			0,       (1 / b),  0,      0,
+			0,        0,       0,     -1,
+			0,        0,      (1/ d), (c / d)
+		}
+	};
+
+	return result;
+}
+
+Mat4x4FInv M4x4F_CameraView(V3f x, V3f y, V3f z, V3f p) {
+	Mat4x4FInv result;
+
+	// Construct orthonomal basis from axes
+	//
+	result.fwd = M4x4F_Rows(x, y, z);
+	V3f txp    = V3f_Neg(M4x4F_VMul3(result.fwd, p));
+
+	// Translate by txp
+	//
+	result.fwd.r[0].w += txp.x;
+	result.fwd.r[1].w += txp.y;
+	result.fwd.r[2].w += txp.z;
+
+	// Calculate inverse axes
+	//
+	V3f ix = V3f_Scale(x, 1.0f / V3f_Dot(x, x));
+	V3f iy = V3f_Scale(y, 1.0f / V3f_Dot(y, y));
+	V3f iz = V3f_Scale(z, 1.0f / V3f_Dot(z, y));
+
+	// Calculate inverse position
+	//
+	V3f ip;
+	ip.x = (txp.x * ix.x) + (txp.y * iy.x) + (txp.z * iz.x);
+	ip.y = (txp.x * ix.y) + (txp.y * iy.y) + (txp.z * iz.y);
+	ip.z = (txp.x * ix.z) + (txp.y * iy.z) + (txp.z * iz.z);
+
+	result.inv = M4x4F_Columns(ix, iy, iz);
+
+	// Translate by ip
+	//
+	result.inv.r[0].w -= ip.x;
+	result.inv.r[1].w -= ip.y;
+	result.inv.r[2].w -= ip.z;
+
+	return result;
+}
+
+

code/core/macros.h

@@ -4,6 +4,7 @@
 #include <assert.h>
 
 #define Assert(exp) assert(exp)
+#define StaticAssert(exp) static_assert(exp, #exp)
 
 #define ArraySize(x) (sizeof(x) / sizeof((x)[0]))
 #define Min(a, b) ((a) < (b) ? (a) : (b))

code/core/math.h

@@ -0,0 +1,117 @@
+#if !defined(LD_CORE_MATH_H_)
+#define LD_CORE_MATH_H_
+
+#define PI_F32  (3.14159265358979323846264338f)
+#define TAU_F32 (2.0f * PI_F32)
+
+typedef union V2f V2f;
+union V2f {
+	struct {
+		F32 x, y;
+	};
+
+	struct {
+		F32 u, v;
+	};
+
+	struct {
+		F32 w, h;
+	};
+
+	F32 e[2];
+};
+
+typedef union V2i V2i;
+union V2i {
+	struct {
+		U32 x, y;
+	};
+
+	struct {
+		U32 w, h;
+	};
+
+	U32 e[2];
+};
+
+typedef union V3f V3f;
+union V3f {
+	struct {
+		F32 x, y, z;
+	};
+
+	struct {
+		F32 r, g, b;
+	};
+
+	struct {
+		F32 w, h, d;
+	};
+
+	struct {
+		V2f xy;
+		F32 _z;
+	};
+
+	F32 e[3];
+};
+
+typedef union V4f V4f;
+union V4f {
+	struct {
+		F32 x, y, z, w;
+	};
+
+	struct {
+		F32 r, g, b, a;
+	};
+
+	struct {
+		V3f xyz;
+		F32 _w;
+	};
+
+	F32 e[4];
+};
+
+typedef union Mat4x4F Mat4x4F;
+union Mat4x4F {
+	F32 m[4][4];
+	F32 e[16];
+	V4f r[4];
+};
+
+typedef struct Mat4x4FInv Mat4x4FInv;
+struct Mat4x4FInv {
+	Mat4x4F fwd;
+	Mat4x4F inv;
+};
+
+typedef struct R2f R2f;
+struct R2f {
+	V2f min;
+	V2f max;
+};
+
+function V2f V2F(F32 x, F32 y);
+function V3f V3F(F32 x, F32 y, F32 z);
+function V4f V4F(F32 x, F32 y, F32 z, F32 w);
+
+function R2f R2F(V2f min, V2f max);
+
+function V3f V3f_Neg(V3f x);
+function V3f V3f_Scale(V3f x, F32 s);
+
+function F32 V3f_Dot(V3f a, V3f b);
+function F32 V4f_Dot(V4f a, V4f b);
+
+function Mat4x4F M4x4F_Rows(V3f x, V3f y, V3f z);
+function Mat4x4F M4x4F_Columns(V3f x, V3f y, V3f z);
+
+function V4f M4x4F_VMul4(Mat4x4F m, V4f v);
+function V3f M4x4F_VMul3(Mat4x4F m, V3f v);
+
+function Mat4x4FInv M4x4F_Perspective(F32 fov, F32 aspect, F32 nearp, F32 farp);
+function Mat4x4FInv M4x4F_CameraView(V3f x, V3f y, V3f z, V3f p);
+
+#endif  // LD_CORE_MATH_H_

code/core/types.h

@@ -29,18 +29,6 @@ struct Str8 {
 	U8 *data;
 };
 
-typedef struct V2f V2f;
-struct V2f {
-  F32 x;
-  F32 y;
-};
-
-typedef struct V2i V2i;
-struct V2i {
-  U32 x;
-  U32 y;
-};
-
 #define U8_MAX  ((U8)  -1)
 #define U16_MAX ((U16) -1)
 #define U32_MAX ((U32) -1)

code/draw/core.c

@@ -0,0 +1,132 @@
+void D_Begin(D_Context *draw, Vk_Frame *frame, U32 max_rects) {
+	Vk_Buffer *rbo   = &frame->rbo;
+
+	draw->rbo       = rbo;
+	draw->n_rects   = 0;
+	draw->max_rects = max_rects;
+	draw->rects     = rbo->data;
+}
+
+void D_End(D_Context *draw, Vk_Frame *frame) {
+	VkCommandBuffer cmd = frame->cmd;
+	Vk_Pipeline *basic  = &draw->pipelines[0];
+
+	// We can probably stop doing this at some point
+	VkDescriptorSet set;
+	VkDescriptorSetAllocateInfo alloc_info = { 0 };
+	alloc_info.sType              = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
+	alloc_info.descriptorPool     = frame->descriptors;
+	alloc_info.descriptorSetCount = 1;
+	alloc_info.pSetLayouts        = &basic->layout.set;
+
+	vk.AllocateDescriptorSets(vk.device, &alloc_info, &set);
+
+	// 'update' the descriptor sets for binding
+	M_TempScope(0, 0) {
+		VkWriteDescriptorSet writes[2] = { 0 };
+
+		VkDescriptorBufferInfo rbo_info = { 0 };
+		rbo_info.buffer = draw->rbo->handle;
+		rbo_info.offset = 0;
+		rbo_info.range  = VK_WHOLE_SIZE;
+
+		VkDescriptorImageInfo *image_info = M_ArenaPush(temp.arena, VkDescriptorImageInfo, .count = draw->n_images);
+
+		for (U32 it = 0; it < draw->n_images; ++it) {
+			image_info[it].imageView   = draw->images[it].image.view;
+			image_info[it].sampler     = vk.sampler;
+			image_info[it].imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
+		}
+
+		writes[0].sType           = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+		writes[0].dstSet          = set;
+		writes[0].dstBinding      = 0;
+		writes[0].descriptorCount = 1;
+		writes[0].descriptorType  = VK_DESCRIPTOR_TYPE_STORAGE_BUFFER;
+		writes[0].pBufferInfo     = &rbo_info;
+
+		writes[1].sType           = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+		writes[1].dstSet          = set;
+		writes[1].dstBinding      = 1;
+		writes[1].descriptorCount = draw->n_images;
+		writes[1].descriptorType  = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
+		writes[1].pImageInfo      = image_info;
+
+		vk.UpdateDescriptorSets(vk.device, ArraySize(writes), writes, 0, 0);
+	}
+
+	vk.CmdBindPipeline(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, basic->handle);
+	vk.CmdBindDescriptorSets(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, basic->layout.pipeline, 0, 1, &set, 0, 0);
+	vk.CmdPushConstants(cmd, basic->layout.pipeline, VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(Mat4x4F), &draw->camera->proj.fwd);
+
+	VkViewport viewport = { 0, 0, (F32) draw->window_width, (F32) draw->window_height, 0.0f, 1.0f };
+	VkRect2D   scissor  = { 0, 0, draw->window_width, draw->window_height };
+
+	vk.CmdSetViewport(cmd, 0, 1, &viewport);
+	vk.CmdSetScissor(cmd, 0, 1, &scissor);
+
+	vk.CmdDraw(cmd, 6, draw->n_rects, 0, 0);
+}
+
+internal U32 V4f_UnormColour(V4f c) {
+	// @Todo: SRGB handling
+	U32 result =
+		((U8) (255.0f * c.a)) << 24 |
+		((U8) (255.0f * c.r)) << 16 |
+		((U8) (255.0f * c.g)) <<  8 |
+		((U8) (255.0f * c.b)) <<  0;
+
+	return result;
+}
+
+void _D_Rect(D_Context *draw, D_RectOpts *opts) {
+	if (draw->n_rects < draw->max_rects) {
+		D_Rect *rect = &draw->rects[draw->n_rects];
+
+		rect->texture = opts->texture;
+
+		rect->x = opts->p.x;
+		rect->y = opts->p.y;
+
+		rect->uv[0] = opts->uv.min.x;
+		rect->uv[1] = opts->uv.min.y;
+		rect->uv[2] = opts->uv.max.x;
+		rect->uv[3] = opts->uv.max.y;
+
+		rect->angle = opts->angle;
+
+		if (opts->flags & D_RECT_PER_VERTEX_COLOUR) {
+			rect->c[0] = V4f_UnormColour(opts->vtxc[0]);
+			rect->c[1] = V4f_UnormColour(opts->vtxc[1]);
+			rect->c[2] = V4f_UnormColour(opts->vtxc[2]);
+			rect->c[3] = V4f_UnormColour(opts->vtxc[3]);
+		}
+		else {
+			U32 unorm = V4f_UnormColour(opts->c);
+
+			rect->c[0] = unorm;
+			rect->c[1] = unorm;
+			rect->c[2] = unorm;
+			rect->c[3] = unorm;
+		}
+
+		if (opts->flags & D_RECT_IGNORE_ASPECT) {
+			rect->w = opts->w;
+			rect->h = opts->h;
+		}
+		else {
+			Vk_Image *image = &draw->images[opts->texture].image;
+
+			if (image->width > image->height) {
+				rect->w = opts->scale * ((F32) image->width / (F32) image->height);
+				rect->h = opts->scale;
+			}
+			else {
+				rect->w = opts->scale;
+				rect->h = opts->scale * ((F32) image->height / (F32) image->width);
+			}
+		}
+
+		draw->n_rects += 1;
+	}
+}

code/draw/core.h

@@ -0,0 +1,85 @@
+#if !defined(LD_DRAW_CORE_H_)
+#define LD_DRAW_CORE_H_
+
+#define D_MAX_RECTS 1024
+
+typedef struct D_Image D_Image;
+struct D_Image {
+	Str8     name;
+	Vk_Image image;
+};
+
+typedef struct D_Rect D_Rect;
+struct D_Rect {
+	U32 texture;
+
+	U32  c[4]; // per-vertex colours
+	F32 uv[4];
+
+	F32 angle;
+	F32 x, y;
+	F32 w, h;
+
+	U32 p0, p1;
+};
+
+StaticAssert(sizeof(D_Rect) == 64);
+
+struct G_Camera;
+
+typedef struct D_Context D_Context;
+struct D_Context {
+	Vk_Buffer *rbo;
+
+	U32 n_pipelines;
+	Vk_Pipeline *pipelines;
+
+	U32 n_images;
+	D_Image *images;
+
+	U32 max_rects;
+	U32 n_rects;
+	D_Rect *rects;
+
+	U32 window_width;
+	U32 window_height;
+
+	struct G_Camera *camera;
+};
+
+typedef U32 D_RectFlags;
+enum D_RectFlags {
+	D_RECT_IGNORE_ASPECT     = (1 << 0), // by default only width is used as a "dimension"
+	D_RECT_PER_VERTEX_COLOUR = (1 << 1), // split colours per vertex
+};
+
+typedef struct D_RectOpts D_RectOpts;
+struct D_RectOpts {
+	D_RectFlags flags;
+
+	U32 texture;
+
+	R2f uv;
+	V2f p;
+
+	F32 angle;
+
+	union {
+		F32 w, h;
+		F32 scale, _h;
+		V2f dim;
+	};
+
+	union {
+		V4f c;
+		V4f vtxc[4];
+	};
+};
+
+function void D_Begin(D_Context *draw, Vk_Frame *frame, U32 max_rects);
+function void D_End(D_Context *draw, Vk_Frame *frame);
+
+function void _D_Rect(D_Context *draw, D_RectOpts *opts);
+#define D_Rect(draw, x, y, ...) _D_Rect(draw, &(D_RectOpts) { .p = V2F(x, y), .uv = R2F(V2F(0, 0), V2F(1, 1)), .scale = 1, .c = V4F(1, 1, 1, 1), ##__VA_ARGS__ })
+
+#endif  // LD_DRAW_CORE_H_

code/first.c

@@ -11,6 +11,8 @@
 #include "os/core.h"
 
 #include "vulkan/core.h"
+#include "draw/core.h"
+
 #include "game/core.h"
 
 #include "game/world.h"
@@ -37,7 +39,6 @@ int main(int argc, char **argv) {
 	Vk_Setup(window);
 
 	G_State *game = 0;
-	G_Image *img  = 0;
 	{
 		M_Arena *arena = M_ArenaAlloc(GB(64), .initial = MB(4));
 		game = M_ArenaPush(arena, G_State);
@@ -47,33 +48,28 @@ int main(int argc, char **argv) {
 		G_ImagesLoad(game);
 		G_PipelinesLoad(game);
 
-		for (U32 it = 0; it < game->n_images; ++it) {
-			if (Str8_Equal(game->images[it].name, S("saloon_ext"), 0)) {
-				img = &game->images[it];
-				break;
-			}
-		}
+		G_Camera *camera = &game->camera;
 
-		if (!img) { img = &game->images[0]; }
+		camera->x = V3F(1, 0, 0);
+		camera->y = V3F(0, 1, 0);
+		camera->z = V3F(0, 0, 1);
+		camera->p = V3F(0, 0, 48);
 
-		Vk_Buffer *vbo = &game->vbo;
-		vbo->size         = KB(4096);
-		vbo->usage        = VK_BUFFER_USAGE_STORAGE_BUFFER_BIT;
-		vbo->host_visible = true;
+		camera->fov = 60.0f;
 
-		Vk_BufferCreate(vbo);
+		camera->nearp = 0.01f;
+		camera->farp  = 1000.0f;
 
-		G_Vertex *vertices = cast(G_Vertex *) vbo->data;
-
-		vertices[0] = (G_Vertex) { -0.25f, -0.25f, 1.0f, 1.0f, 0.0f, 0.0f, 0xFFFFFFFF, 0};
-		vertices[1] = (G_Vertex) {  0.25f, -0.25f, 1.0f, 1.0f, 1.0f, 0.0f, 0xFFFFFFFF, 0};
-		vertices[2] = (G_Vertex) { -0.25f,  0.25f, 1.0f, 1.0f, 0.0f, 1.0f, 0xFFFFFFFF, 0};
-
-		vertices[3] = (G_Vertex) {  0.25f, -0.25f, 1.0f, 1.0f, 1.0f, 0.0f, 0xFFFFFFFF, 0};
-		vertices[4] = (G_Vertex) {  0.25f,  0.25f, 1.0f, 1.0f, 1.0f, 1.0f, 0xFFFFFFFF, 0};
-		vertices[5] = (G_Vertex) { -0.25f,  0.25f, 1.0f, 1.0f, 0.0f, 1.0f, 0xFFFFFFFF, 0};
+		game->draw.camera = camera;
 	}
 
+	Vk_Buffer rbo = { 0 };
+	rbo.usage        = VK_BUFFER_USAGE_STORAGE_BUFFER_BIT;
+	rbo.size         = KB(4);
+	rbo.host_visible = true;
+
+	Vk_BufferCreate(&rbo);
+
 	bool running = true;
 	Player player;
 	player.pos.x = 0;
@@ -97,9 +93,12 @@ int main(int argc, char **argv) {
         .currentNavNode = 0
       }
     },
-    .navMesh = TestNavMesh,
+    .navMesh = &TestNavMesh,
     .npcPOI = {100}
   };
+
+	printf("%zu size in bytes\n", sizeof(TestNavMesh));
+
 	while (running)
 	{
 		SDL_Event e;
@@ -111,11 +110,17 @@ int main(int argc, char **argv) {
 				running = false;
 			}
 		}
-    UpdateNPCs(1.0/60.0, &world);
+
+    updateNPCs(1.0f / 60.0f, &world);
 
 		int w, h;
 		SDL_GetWindowSizeInPixels(window, &w, &h);
 
+		game->draw.window_width  = w;
+		game->draw.window_height = h;
+
+		G_CalulateCamera(&game->camera, (F32) w / (F32) h);
+
 		Vk_Frame *frame = Vk_FrameBegin(window);
 		VkCommandBuffer cmd = frame->cmd;
 
@@ -126,78 +131,32 @@ int main(int argc, char **argv) {
 		clear_colour.color.float32[3] = 1.0f;
 
 		VkRenderingAttachmentInfo colour_attachment = {0};
-		colour_attachment.sType = VK_STRUCTURE_TYPE_RENDERING_ATTACHMENT_INFO;
-		colour_attachment.imageView = vk.swapchain.views[frame->image];
+		colour_attachment.sType       = VK_STRUCTURE_TYPE_RENDERING_ATTACHMENT_INFO;
+		colour_attachment.imageView   = vk.swapchain.views[frame->image];
 		colour_attachment.imageLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
-		colour_attachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
-		colour_attachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
-		colour_attachment.clearValue = clear_colour;
+		colour_attachment.loadOp      = VK_ATTACHMENT_LOAD_OP_CLEAR;
+		colour_attachment.storeOp     = VK_ATTACHMENT_STORE_OP_STORE;
+		colour_attachment.clearValue  = clear_colour;
 
 		VkRenderingInfo rendering_info = {0};
-		rendering_info.sType = VK_STRUCTURE_TYPE_RENDERING_INFO;
-		rendering_info.renderArea = (VkRect2D){0, 0, w, h};
-		rendering_info.layerCount = 1;
+		rendering_info.sType                = VK_STRUCTURE_TYPE_RENDERING_INFO;
+		rendering_info.renderArea           = (VkRect2D) { 0, 0, w, h };
+		rendering_info.layerCount           = 1;
 		rendering_info.colorAttachmentCount = 1;
-		rendering_info.pColorAttachments = &colour_attachment;
+		rendering_info.pColorAttachments    = &colour_attachment;
 
 		vk.CmdBeginRendering(cmd, &rendering_info);
 
-		Vk_Pipeline *basic = &game->pipelines[0];
+		D_Begin(&game->draw, frame, D_MAX_RECTS);
 
-		VkDescriptorSet set;
-		VkDescriptorSetAllocateInfo alloc_info = { 0 };
-		alloc_info.sType              = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
-		alloc_info.descriptorPool     = frame->descriptors;
-		alloc_info.descriptorSetCount = 1;
-		alloc_info.pSetLayouts        = &basic->layout.set;
+		D_Rect(&game->draw,  0.0f, 0.0f, .texture = 1);
+		D_Rect(&game->draw, -8.0f, 0.0f, .texture = 2, .scale = 2.0f);
+		D_Rect(&game->draw,  6.0f, 0.0f, .texture = 3);
 
-		vk.AllocateDescriptorSets(vk.device, &alloc_info, &set);
-
-		// 'update' the descriptor sets for binding
-		{
-			VkWriteDescriptorSet writes[2] = { 0 };
-
-			VkDescriptorBufferInfo vbo_info = { 0 };
-			vbo_info.buffer = game->vbo.handle;
-			vbo_info.offset = 0;
-			vbo_info.range  = 256;
-
-			VkDescriptorImageInfo image_info = { 0 };
-			image_info.imageView   = img->image.view;
-			image_info.sampler     = vk.sampler;
-			image_info.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
-
-			writes[0].sType           = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
-			writes[0].dstSet          = set;
-			writes[0].dstBinding      = 0;
-			writes[0].descriptorCount = 1;
-			writes[0].descriptorType  = VK_DESCRIPTOR_TYPE_STORAGE_BUFFER;
-			writes[0].pBufferInfo     = &vbo_info;
-
-			writes[1].sType           = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
-			writes[1].dstSet          = set;
-			writes[1].dstBinding      = 1;
-			writes[1].descriptorCount = 1;
-			writes[1].descriptorType  = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
-			writes[1].pImageInfo      = &image_info;
-
-			vk.UpdateDescriptorSets(vk.device, ArraySize(writes), writes, 0, 0);
-		}
-
-		vk.CmdBindPipeline(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, basic->handle);
-		vk.CmdBindDescriptorSets(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, basic->layout.pipeline, 0, 1, &set, 0, 0);
-
-		VkViewport viewport = { 0, 0, (F32) w, (F32) h, 0.0f, 1.0f };
-		VkRect2D   scissor  = { 0, 0, w, h };
-
-		vk.CmdSetViewport(cmd, 0, 1, &viewport);
-		vk.CmdSetScissor(cmd, 0, 1, &scissor);
-
-		vk.CmdDraw(cmd, 6, 1, 0, 0);
+		D_End(&game->draw, frame);
 
 		vk.CmdEndRendering(cmd);
 
-
 		Vk_FrameEnd();
 	}
 
@@ -210,4 +169,5 @@ int main(int argc, char **argv) {
 #include "core/core.c"
 #include "os/core.c"
 #include "vulkan/core.c"
+#include "draw/core.c"
 #include "game/core.c"

code/game/core.c

@@ -1,5 +1,9 @@
+// @Todo:  These should move to draw/core.c
+//
 void G_ImagesLoad(G_State *game) {
 	M_TempScope(0, 0) {
+		D_Context *draw = &game->draw;
+
 		Str8 exe_path = FS_SystemPath(temp.arena, FS_SYSTEM_PATH_EXE);
 		Str8 path     = Sf(temp.arena, "%.*s/assets", Sv(exe_path));
 
@@ -17,15 +21,99 @@ void G_ImagesLoad(G_State *game) {
 
 		Vk_CommandBuffer *cmds = Vk_CommandBufferPush();
 
+		// We reserve the first texture for the "white" texture
+		draw->n_images = 1;
+
 		for (FS_Entry *it = assets.first; it != 0; it = it->next) {
 			if (Str8_EndsWith(it->basename, S("png"))) {
-				game->n_images += 1;
+				draw->n_images += 1;
 			}
 		}
 
 		VkBufferImageCopy copy = { 0 };
-		game->images = M_ArenaPush(game->arena, G_Image, .count = game->n_images);
-		game->n_images = 0;
+		draw->images = M_ArenaPush(game->arena, D_Image, .count = draw->n_images);
+		draw->n_images = 1;
+
+		// Upload the white texture
+		{
+			D_Image *white   = &draw->images[0];
+			U32 white_data[] = { 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
+
+			M_CopySize(base, white_data, sizeof(white_data));
+
+			copy.bufferOffset = offset;
+			copy.bufferRowLength = 0;
+			copy.bufferImageHeight = 0;
+
+			copy.imageSubresource.aspectMask     = VK_IMAGE_ASPECT_COLOR_BIT;
+			copy.imageSubresource.mipLevel       = 0;
+			copy.imageSubresource.baseArrayLayer = 0;
+			copy.imageSubresource.layerCount     = 1;
+
+			copy.imageExtent.width  = 2;
+			copy.imageExtent.height = 2;
+			copy.imageExtent.depth  = 1;
+
+			base   += sizeof(white_data);
+			offset += sizeof(white_data);
+
+			white->name = S("_WHITE");
+
+			white->image.width  = 2;
+			white->image.height = 2;
+			white->image.format = VK_FORMAT_R8G8B8A8_SRGB;
+			white->image.usage  = VK_IMAGE_USAGE_SAMPLED_BIT;
+
+			Vk_ImageCreate(&white->image);
+
+			// We could combine all of these 'pre-transfer' and 'post-transfer' layers into one
+			// batch, it would simply mean doing three loops over the images and setting them all up
+			// and submitting them in one go. It doesn't really matter for now
+			//
+
+			VkImageMemoryBarrier2 transfer = { 0 };
+			VkImageMemoryBarrier2 shader_read = { 0 };
+
+			transfer.sType         = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER_2;
+			transfer.srcStageMask  = VK_PIPELINE_STAGE_2_NONE;
+			transfer.srcAccessMask = VK_ACCESS_2_NONE;
+			transfer.dstStageMask  = VK_PIPELINE_STAGE_2_TRANSFER_BIT;
+			transfer.dstAccessMask = VK_ACCESS_2_TRANSFER_WRITE_BIT;
+			transfer.oldLayout     = VK_IMAGE_LAYOUT_UNDEFINED;
+			transfer.newLayout     = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
+			transfer.image         = white->image.handle;
+
+			transfer.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
+			transfer.subresourceRange.layerCount = 1;
+			transfer.subresourceRange.levelCount = 1;
+
+			shader_read.sType         = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER_2;
+			shader_read.srcStageMask  = VK_PIPELINE_STAGE_2_TRANSFER_BIT;
+			shader_read.srcAccessMask = VK_ACCESS_2_TRANSFER_WRITE_BIT;
+			shader_read.dstStageMask  = VK_PIPELINE_STAGE_2_FRAGMENT_SHADER_BIT;
+			shader_read.dstAccessMask = VK_ACCESS_2_SHADER_SAMPLED_READ_BIT;
+			shader_read.oldLayout     = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
+			shader_read.newLayout     = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
+			shader_read.image         = white->image.handle;
+
+			shader_read.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
+			shader_read.subresourceRange.layerCount = 1;
+			shader_read.subresourceRange.levelCount = 1;
+
+			VkDependencyInfo dep = { 0 };
+			dep.sType = VK_STRUCTURE_TYPE_DEPENDENCY_INFO;
+
+			dep.imageMemoryBarrierCount = 1;
+			dep.pImageMemoryBarriers    = &transfer;
+
+			vk.CmdPipelineBarrier2(cmds->handle, &dep);
+
+			vk.CmdCopyBufferToImage(cmds->handle, staging.handle, white->image.handle, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, &copy);
+
+			dep.pImageMemoryBarriers = &shader_read;
+
+			vk.CmdPipelineBarrier2(cmds->handle, &dep);
+		}
 
 		// Image upload is sbi_load -> copy to staging -> upload to gpu texture
 
@@ -35,7 +123,7 @@ void G_ImagesLoad(G_State *game) {
 				stbi_uc *data = stbi_load((const char *) it->path.data, &w, &h, &c, 4);
 
 				if (data) {
-					G_Image *image = &game->images[game->n_images];
+					D_Image *image = &draw->images[draw->n_images];
 
 					U64 image_sz = 4 * w * h;
 
@@ -59,7 +147,7 @@ void G_ImagesLoad(G_State *game) {
 
 					Assert(offset <= staging.size);
 
-					game->n_images += 1;
+					draw->n_images += 1;
 
 					image->name = Str8_Copy(game->arena, Str8_RemoveAfterLast(it->basename, '.'));
 
@@ -126,9 +214,11 @@ void G_ImagesLoad(G_State *game) {
 }
 
 void G_PipelinesLoad(G_State *game) {
-	game->pipelines = M_ArenaPush(game->arena, Vk_Pipeline, .count = 1);
+	D_Context *draw = &game->draw;
 
-	Vk_Pipeline *basic = &game->pipelines[0];
+	draw->pipelines = M_ArenaPush(game->arena, Vk_Pipeline, .count = 1);
+
+	Vk_Pipeline *basic = &draw->pipelines[0];
 
 	VkShaderModule vshader = 0, fshader = 0;
 	M_TempScope(0, 0) {
@@ -161,20 +251,27 @@ void G_PipelinesLoad(G_State *game) {
 
 		bindings[1].binding         = 1;
 		bindings[1].descriptorType  = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
-		bindings[1].descriptorCount = 1;
+		bindings[1].descriptorCount = game->draw.n_images;
 		bindings[1].stageFlags      = VK_SHADER_STAGE_FRAGMENT_BIT;
 
 		VkDescriptorSetLayoutCreateInfo set_info = { 0 };
 		set_info.sType        = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO;
-		set_info.bindingCount = 2;
+		set_info.bindingCount = ArraySize(bindings);
 		set_info.pBindings    = bindings;
 
 		vk.CreateDescriptorSetLayout(vk.device, &set_info, 0, &basic->layout.set);
 
+		VkPushConstantRange push_range = { 0 };
+		push_range.stageFlags = VK_SHADER_STAGE_VERTEX_BIT;
+		push_range.offset     = 0;
+		push_range.size       = 128;
+
 		VkPipelineLayoutCreateInfo layout_create = { 0 };
-		layout_create.sType          = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
-		layout_create.setLayoutCount = 1;
-		layout_create.pSetLayouts    = &basic->layout.set;
+		layout_create.sType                  = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
+		layout_create.setLayoutCount         = 1;
+		layout_create.pSetLayouts            = &basic->layout.set;
+		layout_create.pushConstantRangeCount = 1;
+		layout_create.pPushConstantRanges    = &push_range;
 
 		vk.CreatePipelineLayout(vk.device, &layout_create, 0, &basic->layout.pipeline);
 	}
@@ -193,6 +290,14 @@ void G_PipelinesLoad(G_State *game) {
 	Vk_PipelineCreate(basic);
 }
 
+void G_CalulateCamera(G_Camera *camera, F32 aspect) {
+	Mat4x4FInv proj = M4x4F_Perspective(camera->fov, aspect, camera->nearp, camera->farp);
+	Mat4x4FInv view = M4x4F_CameraView(camera->x, camera->y, camera->z, camera->p);
+
+	camera->proj.fwd = M4x4F_Mul(proj.fwd, view.fwd);
+	camera->proj.inv = M4x4F_Mul(view.inv, proj.inv);
+}
+
 #include "impl/aabb.c"
 #include "impl/nav.c"
 #include "impl/player.c"

code/game/core.h

@@ -1,36 +1,30 @@
 #if !defined(LD_GAME_CORE_H_)
 #define LD_GAME_CORE_H_
 
-typedef struct G_Vertex G_Vertex;
-struct G_Vertex {
-	F32 x, y, z, w;
-	F32 u, v;
-	U32 c;
-	U32 pad;
-};
+typedef struct G_Camera G_Camera;
+struct G_Camera {
+	V3f x, y, z;
+	V3f p;
 
-typedef struct G_Image G_Image;
-struct G_Image {
-	Str8 name;
-	Vk_Image image;
+	F32 fov;
+	F32 nearp, farp;
+
+	Mat4x4FInv proj;
 };
 
 typedef struct G_State G_State;
 struct G_State {
 	M_Arena *arena;
 
-	U32 n_images;
-	G_Image *images;
-
-	U32 n_pipelines;
-	Vk_Pipeline *pipelines;
-
-	Vk_Buffer vbo;
+	D_Context draw;
+	G_Camera camera;
 };
 
 function void G_ImagesLoad(G_State *game);
 function void G_PipelinesLoad(G_State *game);
 
+function void G_CalulateCamera(G_Camera *camera, F32 aspect);
+
 #include "aabb.h"
 #include "player.h"
 #include "nav.h"

code/game/impl/nav.c

@@ -21,11 +21,10 @@ struct navSearchState{
 navSearchState initState(U32 start, U32 meshSize) {
   navSearchState state = {};
   for(U32 i = 0; i < meshSize; i++) {
-    state.nodeStates[i].visited = false;
+    state.nodeStates[i].visited          = false;
     state.nodeStates[i].addedToUnvisited = false;
-    // underflow to the max :)
-    state.nodeStates[i].distance = U64_MAX;
-    state.nodeStates[i].shortest = 0;
+    state.nodeStates[i].distance         = U64_MAX;
+    state.nodeStates[i].shortest         = 0;
   }
   state.nodeStates[start].distance = 0;
   return state;
@@ -53,8 +52,8 @@ U32 getLowestState(U32 unfinishedIndexes[128], U32 unfinishedCount, navSearchSta
 }
 
 // Generate a path to follow between the start and end node.
-NavPath Nav_Path(NavMesh mesh, U32 start, U32 end) {
-  navSearchState state = initState(start, mesh.nodeCount);
+NavPath Nav_Path(NavMesh *mesh, U32 start, U32 end) {
+  navSearchState state = initState(start, mesh->nodeCount);
   U32 unfinishedCount = 1;
   U32 unfinishedIndexes[NAV_MAX_NODES] = {start};
   // I don't want to spend time removing items from
@@ -65,19 +64,19 @@ NavPath Nav_Path(NavMesh mesh, U32 start, U32 end) {
   U32 lowestNodeIndex = start;
   bool found = false;
   while(!found) {
-    for(int connectionI = 0 ; connectionI < mesh.nodes[lowestNodeIndex].connectionCount; connectionI++) {
-      NavConnection connection = mesh.nodes[lowestNodeIndex].connections[connectionI];
-      navSearchNodeState *testNode = &state.nodeStates[connection.NodeIndex];
+    for(int connectionI = 0 ; connectionI < mesh->nodes[lowestNodeIndex].connectionCount; connectionI++) {
+      NavConnection      *connection = &mesh->nodes[lowestNodeIndex].connections[connectionI];
+      navSearchNodeState *testNode   = &state.nodeStates[connection->NodeIndex];
       if(testNode->visited) {continue;}
-      U32 distance = cast(U32) (state.nodeStates[lowestNodeIndex].distance + connection.Cost);
-      distance += cast(U32) (mesh.nodes[end].pos.x - mesh.nodes[connection.NodeIndex].pos.x);
-      distance += cast(U32) (mesh.nodes[end].pos.y - mesh.nodes[connection.NodeIndex].pos.y);
+      U32 distance = cast(U32) (state.nodeStates[lowestNodeIndex].distance + connection->Cost);
+      distance += cast(U32) (mesh->nodes[end].pos.x - mesh->nodes[connection->NodeIndex].pos.x);
+      distance += cast(U32) (mesh->nodes[end].pos.y - mesh->nodes[connection->NodeIndex].pos.y);
       if(testNode->distance > distance) {
         testNode->distance = distance;
         testNode->shortest = lowestNodeIndex;
       }
       if(!testNode->addedToUnvisited) {
-        unfinishedIndexes[unfinishedCount] = connection.NodeIndex;
+        unfinishedIndexes[unfinishedCount] = connection->NodeIndex;
         unfinishedCount++;
         testNode->addedToUnvisited = true;
       }

code/game/impl/npc.c

@@ -1,6 +1,7 @@
-#include "../npc.h"
-#include "../world.h"
-#include "../../core/types.h"
+#include "game/npc.h"
+#include "game/world.h"
+#include "core/types.h"
+
 #include <stdio.h>
 
 void updateNPC(F32 delta, NPC *npc, World *world) {
@@ -15,7 +16,7 @@ void updateNPC(F32 delta, NPC *npc, World *world) {
         npc->path = Nav_Path(world->navMesh, npc->currentNavNode, npc->targetNavNode);
         printf("done\n");
         npc->walkTimer = 0;
-        printf("%*.s started walking to %d\n", Sv(npc->name), npc->targetNavNode);
+        printf("%.*s started walking to %d\n", Sv(npc->name), npc->targetNavNode);
       }
     break;
     case NPC_ACTION_WALKING:
@@ -33,17 +34,17 @@ void updateNPC(F32 delta, NPC *npc, World *world) {
         npc->pathIndex+=1;
         npc->currentNavNode = npc->path.indexes[npc->pathIndex];
       }
-      NavNode cNav = world->navMesh.nodes[npc->currentNavNode];
-      NavNode tNav = world->navMesh.nodes[npc->pathIndex];
+      NavNode cNav = world->navMesh->nodes[npc->currentNavNode];
+      NavNode tNav = world->navMesh->nodes[npc->pathIndex];
       npc->collision.pos.x = cNav.pos.x * (1 - npc->walkTimer/NPC_SPEED) + tNav.pos.x * npc->walkTimer/NPC_SPEED;
       npc->collision.pos.y = cNav.pos.y * (1 - npc->walkTimer/NPC_SPEED) + tNav.pos.y * npc->walkTimer/NPC_SPEED;
     break;
   }
 }
 
-void UpdateNPCs(F32 delta, World *world) {
-  for(int i = 0; i < world->npcCount; i++) {
+void updateNPCs(F32 delta, World *world) {
+  for(U32 i = 0; i < world->npcCount; i++) {
     updateNPC(delta, &world->npcs[i], world);
   }
-} 
+}
 

code/game/nav.h

@@ -34,7 +34,6 @@ struct NavMesh{
   NavNode nodes[NAV_MAX_NODES];
 };
 
-
-function NavPath Nav_Path(NavMesh mesh, U32 start, U32 end);
+function NavPath Nav_Path(NavMesh *mesh, U32 start, U32 end);
 
 #endif

code/game/npc.h

@@ -4,7 +4,7 @@
 #include "nav.h"
 #include "../core/types.h"
 
-#define NPC_SPEED 0.2
+#define NPC_SPEED 0.2f
 
 typedef enum NPC_ACTION NPC_ACTION;
 enum NPC_ACTION {

code/game/world.h

@@ -1,24 +1,28 @@
 #if !defined(LD_GAME_WORLD_H_)
 #define LD_GAME_WORLD_H_
+
 #include "player.h"
 #include "npc.h"
 
-// Areas are which 
-enum AREA {
-  WORLD_AREA_OUTSIDE = 1,
-  WORLD_AREA_SALOON = 1 << 1,
+// Areas are which
+typedef U32 World_Area;
+enum World_Area {
+  WORLD_AREA_OUTSIDE = (1 << 0),
+  WORLD_AREA_SALOON  = (1 << 1),
 };
 
 typedef struct World World;
 struct World {
   U32 npcCount;
   NPC npcs[128];
-  NavMesh navMesh;
+
+  NavMesh *navMesh;
+
   // NPC points of interest, places to walk to.
   U32 npcPOI[256];
 };
 
 function void updateWorld(F32 delta, World *world);
-function void UpdateNPCs(F32 delta, World *world);
+function void updateNPCs(F32 delta, World *world);
 
 #endif  // LD_GAME_WORLD_H_

code/vulkan/core.c

@@ -180,6 +180,7 @@ bool Vk_Setup(SDL_Window *window) {
 		features12.storageBuffer8BitAccess           = VK_TRUE;
 		features12.uniformAndStorageBuffer8BitAccess = VK_TRUE;
 		features12.descriptorIndexing                = VK_TRUE;
+		features12.runtimeDescriptorArray            = VK_TRUE;
 
 		// @Todo: we will probably need to enable some of the 'nonuniform' indexing features
 
@@ -371,6 +372,16 @@ bool Vk_Setup(SDL_Window *window) {
 
 		vk.CreateDescriptorPool(vk.device, &descriptor_pool, 0, &frame->descriptors);
 
+		// rect buffer
+		//
+
+		Vk_Buffer *rbo = &frame->rbo;
+		rbo->usage        = VK_BUFFER_USAGE_STORAGE_BUFFER_BIT;
+		rbo->size         = D_MAX_RECTS * sizeof(D_Rect);
+		rbo->host_visible = true;
+
+		Vk_BufferCreate(rbo);
+
 		VkSemaphoreCreateInfo semaphore = { 0 };
 		semaphore.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
 
@@ -546,7 +557,7 @@ internal VkDeviceMemory Vk_Allocate(VkMemoryRequirements *mreq, VkMemoryProperty
 		}
 	}
 
-	if (type_index != -1) {
+	if (type_index != U32_MAX) {
 		VkMemoryAllocateInfo alloc_info = { 0 };
 		alloc_info.sType           = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
 		alloc_info.allocationSize  = mreq->size;
@@ -555,6 +566,7 @@ internal VkDeviceMemory Vk_Allocate(VkMemoryRequirements *mreq, VkMemoryProperty
 		vk.AllocateMemory(vk.device, &alloc_info, 0, &result);
 	}
 
+	Assert(result != VK_NULL_HANDLE);
 	return result;
 }
 
@@ -565,6 +577,7 @@ void Vk_BufferCreate(Vk_Buffer *buffer) {
 	create_info.size  = buffer->size;
 
 	vk.CreateBuffer(vk.device, &create_info, 0, &buffer->handle);
+	Assert(buffer->handle != VK_NULL_HANDLE);
 
 	VkMemoryRequirements req;
 	vk.GetBufferMemoryRequirements(vk.device, buffer->handle, &req);
@@ -579,6 +592,7 @@ void Vk_BufferCreate(Vk_Buffer *buffer) {
 	if (buffer->host_visible) {
 		vk.MapMemory(vk.device, buffer->memory, 0, buffer->size, 0, &buffer->data);
 	}
+
 }
 
 void Vk_ImageCreate(Vk_Image *image) {

code/vulkan/core.h

@@ -96,6 +96,8 @@ struct Vk_Frame {
 	U32 next_scratch;
 	Vk_CommandBuffer scratch[VK_NUM_SCRATCH];
 
+	Vk_Buffer rbo;
+
 	U32 image; // swapchain image index
 };
 

code/vulkan/functions.h

@@ -62,7 +62,10 @@
 	VK_FUNC(CmdDraw);
 	VK_FUNC(CmdSetViewport);
 	VK_FUNC(CmdSetScissor);
+	VK_FUNC(CmdDrawIndexed);
+	VK_FUNC(CmdBindIndexBuffer);
 
+	VK_FUNC(CmdPushConstants);
 	VK_FUNC(CmdCopyBufferToImage);
 	VK_FUNC(CmdPipelineBarrier2);
 	VK_FUNC(CmdBeginRendering);

code/vulkan/shaders/basic.frag

@@ -1,12 +1,15 @@
 #version 460 core
 
+#extension GL_EXT_nonuniform_qualifier : enable
+
 layout(location = 0) in vec2 frag_uv;
 layout(location = 1) in vec4 frag_c;
+layout(location = 2) in flat uint texid;
 
 layout(location = 0) out vec4 framebuffer;
 
-layout(binding = 1) uniform sampler2D u_image;
+layout(binding = 1) uniform sampler2D u_images[];
 
 void main() {
-	framebuffer = frag_c * texture(u_image, frag_uv);
+	framebuffer = frag_c * texture(u_images[texid], frag_uv);
 }

code/vulkan/shaders/basic.vert

@@ -2,6 +2,28 @@
 
 #extension GL_EXT_scalar_block_layout : enable
 
+uint indices[6] = { 0, 1, 3, 0, 3, 2 };
+
+vec2 verticies[4] = vec2[](
+		vec2(-0.5, -0.5),
+		vec2( 0.5, -0.5),
+		vec2(-0.5,  0.5),
+		vec2( 0.5,  0.5)
+);
+
+struct G_Rect {
+	uint id;
+
+	uint   c[4];
+	float uv[4];
+
+	float angle;
+	float x, y;
+	float w, h;
+
+	float _pad0, _pad1;
+};
+
 struct Vertex {
 	vec4 p;
 	vec2 uv;
@@ -9,20 +31,34 @@ struct Vertex {
 	uint pad;
 };
 
+layout(push_constant, row_major)
+uniform Global {
+	mat4 proj;
+};
+
 layout(binding = 0, scalar)
-readonly buffer Vertices {
-	Vertex vtx[];
+readonly buffer Rect {
+	G_Rect rects[];
 };
 
 layout(location = 0) out vec2 frag_uv;
 layout(location = 1) out vec4 frag_c;
+layout(location = 2) out flat uint texid;
+
+vec4 unorm_colour(uint c) {
+	vec4 result = vec4((c >> 0) & 0xFF, (c >> 8) & 0xFF, (c >> 16) & 0xFF, (c >> 24) & 0xFF) / 255.0f;
+	return result;
+}
 
 void main() {
-	Vertex v = vtx[gl_VertexIndex];
+	G_Rect rect = rects[gl_InstanceIndex];
+	uint   idx  = indices[gl_VertexIndex];
 
-	gl_Position = v.p;
+	vec2 p = (verticies[idx] * vec2(rect.w, rect.h)) + vec2(rect.x, rect.y);
 
-	frag_uv = v.uv;
-	frag_c  = vec4((v.c >> 24) & 0xFF, (v.c >> 16) & 0xFF, (v.c >> 8) & 0xFF, (v.c >> 0) & 0xFF) / 255.0f;
-	frag_c  = frag_c.abgr;
+	gl_Position = proj * vec4(p, 1.0f, 1.0f);
+
+	frag_uv = vec2(rect.uv[(idx & 1) << 1], rect.uv[1 + (uint(idx / 2) << 1)]);
+	frag_c  = unorm_colour(rect.c[idx]);
+	texid   = rect.id;
 }